Patents by Inventor Karen A. Mikkelson

Karen A. Mikkelson has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Polymerization co-inhibitors for vinyl aromatic compounds
    Patent number: 4468343
    Abstract: A compound and a process for utilizing the compound to prevent the polymerization of vinyl aromatic compounds, such as styrene, during heating. The composition includes effective amounts of 2,6-dinitro-p-cresol and either a phenylenediamine or 4-tert-butylcatechol respectively, to act as a polymerization co-inhibitor system in the presence of oxygen.
    Type: Grant
    Filed: April 11, 1983
    Date of Patent: August 28, 1984
    Assignee: Cosden Technology, Inc.
    Inventors: James R. Butler, James M. Watson, Debra L. Kendall, Karen A. Mikkelson
  • Polymerization inhibition process for vinyl aromatic compounds
    Patent number: 4466905
    Abstract: A compound and a process for utilizing the compound to prevent the polymerization of vinyl aromatic compounds, such as styrene, during heating. The composition includes effective amounts of 2,6-dinitro-p-cresol and either a phenylenediamine or 4-tert-butylcatechol respectively, to act as a polymerization co-inhibitor system in the presence of oxygen.
    Type: Grant
    Filed: April 11, 1983
    Date of Patent: August 21, 1984
    Assignee: Cosden Technology, Inc.
    Inventors: James R. Butler, James M. Watson, Debra L. Kendall, Karen A. Mikkelson
  • Polymerization co-inhibitors for vinyl aromatic compounds
    Patent number: 4466904
    Abstract: A compound and a process for utilizing the compound to prevent the polymerization of vinyl aromatic compounds, such as styrene, during heating. The compound includes effective amounts of phenothiazine, 4-tert-butylcatechol and 2,6-dinitro-p-cresol respectively, as a polymerization inhibitor system in the presence of oxygen resulting in a less viscous polymer tar and in the effective inhibition of polymerization to temperatures as high as 150.degree. C.
    Type: Grant
    Filed: January 10, 1983
    Date of Patent: August 21, 1984
    Assignee: Cosden Technology, Inc.
    Inventors: James M. Watson, James R. Butler, Karen A. Mikkelson